I personally run Amsoil and always have. I think they make a great product and their customer service is solid.
I have been told the same by Blackstone on my cars, though I still do it once a year given the cost is <$75. However, I do follow their advice on intervals, after once being a 5,000 mile interval guy. On all three of our cars, using Castrol Edge 5W-20, I've repeatedly gotten analysis that tells me that, at 7,500-10,000 miles, the oil is still performing as intended.
I've had good luck with Castrol for several years in two WRXs.
AMSoil signature series. Best stuff you can get!
I've used Mobil 1 in all my vehicles before this car. I have chosen Amsoil Signature Series for the WRX.
If your interval is 30,000km / 20k mi (2Y) then you should use the higher spec VW 503 / 504 (left page) if you have the 15,000km / 10k mi (1Y) interval then you can use the lower grade VW 501 / 502 oil on the right page.
I always use Castrol, good quality oil won't hurt the engine and is just slightly more expensive than off-brands.
Amsoil also makes a oil specially formulated for hybrid vehicles since your engine turns on and off more frequently than an average car. Amsoil has a higher Flashpoint than most conventional oils which reduces the amount of oil your car burns.
I'm using Castrol GTX 20W50 because it's the only 20W50 that I can easily find locally. I tried Rotella 15W40 but I found that it gave somewhat low oil pressure on my old engine.
Those guys don't replace you crush washer, and the oil the use is crap.
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